444 



THE IERIGATION AGE. 



to the circle below the horizontal diameter. A some- 

 what similar section is considered in the "Taschenbuch 

 fiir Kanalisations-Ingenieure," by Dr. Ing. Karl Im- 

 hoff (Essen, Germany, 1907), except that the lines form- 

 ing the lower part of the section are inclined at less 

 than 45 degrees to the horizontal and the upper part of 

 the section is square or rectangular. 



Three articles are devoted to The Co-efficient of 

 Roughness, How to Calculate "n," and Explanation of 

 "C" Tables. 



The following seven articles take up and work out the 

 solution of problems involving Open Channels, Closed 

 Channels, Pipes Blowing Full Under Pressure, Loss of 

 Head by Enlargement of Channel, Subdivision of Chan- 

 nels, Loss of Head at Entrance to Pipes, and Ditch Tables 

 and Their Application. The last two articles are devoted 

 to Flow Measurements and the Use of Logarithms. 



The book ends with a series of useful tables. In the 

 first thirteen tables are given values of c in Kutter's for- 

 mula for various values of n, V r and s, followed by tables 

 of numbers and their square roots, used principally for r 

 and 11. Two tables are devoted to giving the hydraulic 

 elements of circular and composite sections partly filled. 

 The remaining tables include Areas and Circumferences of 



Circles, Hydraulic Equivalents. Weights of Various Sub- 

 stances, Metric Conversion Tables, a table for converting 

 the flow of water from one unit to another, a table for de- 

 termining the size of circular conduits with given veloci- 

 ties and volumes of discharge, and tables of Squares, 

 Cubes, Square and Cube Roots, Logarithms and Natural 

 Sines, Cosines, Tangents and Cotangents. Of the tables 

 given those relating to hydraulics are of the most value, 

 especially the tables giving the value of c. 



The book would be materially increased in value by 

 the addition of diagrams for the use of the many engi- 

 neers who prefer to read directly the corresponding size, 

 slope, velocity and discharge instead of having to com- 

 pute the same, even with the assistance of conveniently 

 arranged tables. 



One or two errors have been noted in one of the 

 tables, but it is recognized that some errors are almost 

 sure to occur in the first edition of any book. It is to 

 be hoped that, with a second edition of the book, the 

 author will see fit to adopt the size of page so widely used 

 in the numerous engineering handbooks and also to bind 

 the book in a similar manner, changes which could be 

 readily made and which would not involve any resetting of 

 the type. 



The Good Farmer Watches his Sluices 



But he will not attend to them properly unless he can do so 

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GALVANIZED METAL IRRIGATION FLUME "sss" 



The Xewcomb Patent Key and Band make a water tight expansion connection without the use of bolts, rivets, or solder, and is so simple and 

 easy to put in place that it can be done by anyone with a hammer. The ends of the formed sheets are lapped together. The flat band that carries 

 the weight of the flume is placed on outside of flume. The oval band is then placed on the inside of flume. The channel iron cross bar is 



then placed over the ends of the bands. The channel is 

 pressed down until the ends of the inside band appear through the 

 hole in the channel with the ends of the outside band. The wedge 

 shaped keys are then driven through the slots in the outer bands 

 and resting on the ends of the inner bands. By driving the keys 

 the outer band is drawn upward and the inner band is forced down- 

 ward, clamping the sheets together. The lapped ends of the sheets 

 being left smooth to allow for the contraction and expansion of the 

 flume and permits of turning angles at every joint. The steel chan- 

 nel carrier does away with all wood in the construction of our flume. 

 The oval inner band is made just heavy enough to arrest the travel 

 of sand without retarding the water flow, thus protecting the gal- 

 vanized coating on the inside of flume from the wear of traveling 

 sand. The flange on edge of flume helps to support it on sub- 

 structure and keep it in perfect alignment. 



Section of Flume 



KLAUER MFG. COMPANY, Du , b u w r e 



When writing to advertisers please mention The Irrigation Age. 



